XML 31 R18.htm IDEA: XBRL DOCUMENT
v3.21.2

Components of Net Periodic Benefit Cost | 6 Months Ended
--- | ---
Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost
| Pension Benefits
| Three months ended June 30, |  |  |  | Six months ended June 30,
| 2021 |  | 2020 |  |  |  |  |  | 2021 |  | 2020
Service cost | $ | 0.9 |  |  | $ | 1.1 |  |  |  |  |  |  | $ | 2.3 |  |  | $ | 2.4 |
Interest cost | 2.4 |  |  | $ | 2.8 |  |  |  |  |  |  | 4.8 |  |  | 5.6 |
Expected return on plan assets | (5.6) |  |  | $ | (5.2) |  |  |  |  |  |  | (11.1) |  |  | (10.3) |
Amortization of prior service costs | 0.1 |  |  | 0.0 |  |  |  |  |  | 0.1 |  |  | 0.0
Amortization of net loss | 1.5 |  |  | $ | 1.8 |  |  |  |  |  |  | 3.0 |  |  | 3.3 |
Net periodic benefit cost | $ | (0.7) |  |  | $ | 0.5 |  |  |  |  |  |  | $ | (0.9) |  |  | $ | 1.0 |
| Other Postretirement Benefits ("OPEB")
| Three months ended June 30, |  |  |  | Six months ended June 30,
| 2021 |  | 2020 |  |  |  |  |  | 2021 |  | 2020
Service cost | $ | 0.0 |  |  | $ | 0.1 |  |  |  |  |  |  | $ | 0.1 |  |  | $ | 0.2 |
Interest cost | 0.6 |  |  | 0.7 |  |  |  |  |  |  | 1.2 |  |  | 1.5 |
Amortization of prior service cost | (0.8) |  |  | (0.8) |  |  |  |  |  |  | (1.6) |  |  | (1.6) |
Amortization of net loss | 0.5 |  |  | 0.1 |  |  |  |  |  |  | 1.1 |  |  | 1.1 |
Net periodic benefit cost | $ | 0.3 |  |  | $ | 0.1 |  |  |  |  |  |  | $ | 0.8 |  |  | $ | 1.2 |

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for retirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21916913&loc=d3e273930-122802 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (o) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (p) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(03) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration